Rotary tillage, sowing, ditching and pressing compound operation machine

A rotary tillage, sowing, ditching and pressing compound operation machine, comprising a fertilization and sowing device, an intermediate rotary tillage and ditching device, and a frame, wherein the intermediate rotary tillage and ditching device is mounted at a lower part of the frame, and the fertilization and sowing device connected to the frame is arranged above the intermediate rotary tillage and ditching device;

• and further comprising a liftable ditcher and a multi-stage press wheel device, wherein the liftable ditcher is mounted behind ditching rotary tillage blades of the intermediate rotary tillage and ditching device to perform a ditching operation in cooperation with the ditching rotary tillage blades;
• the intermediate rotary tillage and ditching device comprises a rotary tillage blade shaft, an intermediate ditching cutter head, the ditching rotary tillage blades, and a plurality of sets of rotary tillage blades;
• the rotary tillage blade shaft is horizontally mounted on the frame, the intermediate ditching cutter head rotating synchronously with the rotary tillage blade shaft is fixed at a middle position on the rotary tillage blade shaft, and the ditching rotary tillage blades are respectively fixed on two sides of the intermediate ditching cutter head;
• the plurality of sets of rotary tillage blades are arranged on the rotary tillage blade shaft;
• the multi-stage press wheel device comprises a front press wheel and a rear press wheel, and the front press wheel comprises a front press roller shaft, front press rollers, and connecting rods;
• the front press rollers are respectively mounted on two sides of the front press roller shaft each in a manner of a revolving pair, two ends of the front press roller shaft are respectively sheathed in first ends of the connecting rods, and second ends of the connecting rods are hingedly connected to the frame;
• the front press rollers are located behind the rotary tillage blades of the intermediate rotary tillage and ditching device;
• the rear press wheel comprises a connecting plate, a rear press roller shaft, and a rear press roller;
• a first end of the connecting plate is connected to the rear press roller shaft by a support, and the connecting plate is connected to the frame in a manner of a sliding pair;
• the rear press roller is mounted on the rear press roller shaft in a manner of a revolving pair, and the rear press roller is located behind the liftable ditcher;
• and a second end of the connecting plate is connected to the liftable ditcher to achieve a switching of operation states of the liftable ditcher and the rear press wheel.